"Exploration - Comparing the Speed ​​of Movement of Objects" Simple Movement of Matter PPT Courseware 6

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"Exploration - Comparing the Speed ​​of Movement of Objects" Simple Movement of Matter PPT Courseware 6

Activity: Compare how fast the pieces of paper fall

Discuss:

1. How to compare the speed of their movement?

Let them be released from the same height at the same time. The piece of paper that hits the ground first will move faster.

(Same distance than time)

2. Are there any other methods of comparison?

Let them be released simultaneously from the same height. When they are both in the air, the piece of paper closer to the ground will move faster.

(Same time than distance)

How to compare how fast an object is moving:

1. The same distance and time;

2. Same time and distance.

Do the math:

The fastest animal on land is the cheetah, which can run 800m in 20 seconds. The fastest swimmer in the sea is the sailfish, which can swim 54km in 0.5h. The fastest fly in the sky is the brown swift, which can fly 3000m every 1 minute. Who is the fastest in the animal kingdom?

How to compare?

Use the distance traveled in 1 second to compare.

2. Speed

learning target:

1. Know that speed is a physical quantity that describes how fast an object moves;

2. Understand the definition and unit of speed;

3. Be able to use the speed formula to perform simple calculations initially.

In physics, velocity is used to describe how fast an object moves. The size is equal to the distance traveled by the object in unit time (usually 1 second).

Formula: V=s/t

v represents speed, t represents time, s represents distance,

Activity: Measuring the speed of falling paper

1. To determine the falling speed of a piece of paper, what quantities do you think should be measured?

The height s of the piece of paper falling and the landing time t, then calculate v

2. What experimental equipment did you choose?

Measuring: tape measure or meter ruler;

Measure t: stopwatch or watch.

summary:

1. A method to compare the speed of movement of objects;

2. The definition, meaning, formula and unit of speed;

3. Simple calculation of speed;

4. Method of speed measurement.

Class exercises:

1. Which of the following objects has a moving speed of 15m/s ( )

A. The distance traveled within 2 seconds is 30m;

B. The distance traveled in 0.1s is 3m;

C. The distance traveled within 0.2s is 30m;

D. The distance traveled in 15 seconds is 100m.

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Update Time: 2024-10-03

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